Ash and the others arrive in Alamos Town, where Dawn will take part in a contest. However the sudden appearance of the legendary pokemon Darkrai sends the town's citizens into nightmares and a force to stop Darkrai is formed. However, the town is soon warped to another dimension where a battle between the legendary pokemon Dialga and Palkia is occurring. The battle is threating the safety of the town and its citizens and it is up to Ash, Dawn, Brock, Alice, and Darkrai to stop the two from destroying the town.